Antibacterial polyolefin film containing olive leaf extract, preparation method of antibacterial polyolefin film and sanitary towel applying antibacterial polyolefin film

Abstract

The invention relates to the technical field of films, and particularly discloses an antibacterial polyolefin film containing olive leaf extract, a preparation method of the antibacterial polyolefin film and a sanitary towel applying the antibacterial polyolefin film. The invention discloses a bacteriostatic polyolefin film containing olive leaf extract. The bacteriostatic polyolefin film comprises a polyolefin film and a bacteriostatic coating arranged on the polyolefin film, the antibacterial coating is prepared from the following raw materials in parts by weight: 8 to 12 parts of olive leaf extract and 88 to 92 parts of ethanol solution. The preparation method of the antibacterial polyolefin film containing the olive leaf extract comprises the following steps: dissolving the olive leaf extract in an ethanol solution to obtain a coating solution, coating the polyolefin film with the coating solution for the first time, then drying for the first time, then coating a coating layer for the second time, and then drying for the second time to obtain the antibacterial polyolefin film containing the olive leaf extract. The antibacterial coating is formed, and the antibacterial polyolefin film containing the olive leaf extract is obtained.

Description

Technical Field

[0001] This application relates to the technical field of films, and in particular to an antibacterial polyolefin film containing olive leaf extract, a method for preparing the same, and sanitary napkins using the same film. Background Technology

[0002] During menstruation, women inevitably have prolonged contact between their genitals and sanitary napkins, resulting in significant friction. The warm and humid environment is also highly conducive to bacterial growth, which can negatively impact women's health.

[0003] Currently, the most common antibacterial solutions on the market involve adding an antibacterial surface layer to the core of sanitary napkins, but these solutions are insufficient in terms of ingredients, release speed, and health impact. Summary of the Invention

[0004] To enhance the antibacterial protection during women's menstrual period, this application provides an antibacterial polyolefin film containing olive leaf extract, a method for preparing the film, and a sanitary napkin using the film.

[0005] In a first aspect, this application provides an antibacterial polyolefin film containing olive leaf extract, which adopts the following technical solution: An antibacterial polyolefin film containing olive leaf extract includes a polyolefin film and an antibacterial coating disposed on the polyolefin film; the raw materials of the antibacterial coating include 8-12 parts by weight of olive leaf extract and 88-92 parts by weight of ethanol solution.

[0006] By adopting the above technical solution, an antibacterial coating containing olive leaf extract is set on a polyolefin film and applied to sanitary napkins. When the antibacterial coating comes into contact with slightly alkaline menstrual blood, the active ingredients in the olive leaf extract are released. The active ingredients in olive leaf extract mainly include oleuropein, flavonoids, terpenes and their derivatives. Oleuropein is one of the most bioactive components in olive leaves, with broad-spectrum antibacterial effects. It can interfere with the amino acid metabolism or protein synthesis necessary for bacterial growth, thereby inhibiting its proliferation. At the same time, studies have shown that it has an inhibitory effect on certain viruses, possibly by blocking the viral adsorption or replication process. It exhibits significant inhibitory effects against various Gram-positive and Gram-negative bacteria, Candida albicans, Campylobacter jejuni, Helicobacter pylori, Escherichia coli, and Klebsiella pneumoniae. Flavonoids provide health benefits through cell signaling pathways and antioxidant effects, helping to enhance the body's immunity and thus combat bacterial infections. Terpenes and their derivatives also possess certain antibacterial activity, synergistically inhibiting bacterial growth with other active ingredients. Furthermore, olive leaf extract has no particular effect on skin symbiotic bacteria and possesses a distinctive botanical aroma that can mask some bloody odor, thus achieving antibacterial, odor-suppressing, and women's health-maintaining effects. The effective antibacterial properties of olive leaf extract within the pH range of 5.0-8.0 prevent accidental release from the normal vagina in an acidic environment with a pH less than 4.5, improving the persistence of antibacterial activity.

[0007] In one specific implementation, the method for preparing the olive leaf extract includes the following steps: Raw material pretreatment: Soak olive leaves in a 0.85%-0.9% salt solution for 1-2 hours, then rinse with clean water, and then crush them into olive microparticles with a particle size of 1-3 mm. Enzymatic hydrolysis: Water is first added to olive microparticles, then an enzyme treatment agent is added, and the mixture is kept at 40-60℃ for 3-6 hours to obtain an enzymatic hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acid pectinase; Ultrasonic treatment: The enzymatic hydrolysate is placed in an ultrasonic extractor and ultrasonically treated to obtain the treated solution; Filtration: The liquid is filtered using a filter membrane with a pore size of 0.1-0.45μm to remove macromolecular impurities and residues, resulting in a crude extract. Refining: Add 0.8 mol / L sulfuric acid solution to the crude extract to adjust the pH to 3-4, then add ethanol aqueous solution, stir and mix evenly, let stand to separate the layers, and concentrate the organic phase under reduced pressure to obtain olive leaf extract.

[0008] By adopting the above technical solution, olive leaves are first soaked in salt water to remove surface impurities, then crushed to obtain olive microparticles. Next, a complex enzyme composed of cellulase and acid pectinase is added to facilitate the release of active ingredients in the olive microparticles. Then, ultrasonic treatment is performed to accelerate the dissolution of components using the cavitation effect. Finally, the mixture is filtered and refined to obtain olive leaf extract.

[0009] In one specific implementation, in the enzymatic hydrolysis step, the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is (0.3-1.5):100.

[0010] By adopting the above technical solution, the ratio of cellulase to acidic pectinase in the enzyme treatment agent and the amount of enzyme treatment agent are further limited, thereby facilitating the release of active ingredients in olive microparticles.

[0011] In one specific implementation, during the extraction step, the temperature for vacuum concentration is 40-50°C, and the concentration is reduced to one-tenth of the original volume to obtain olive leaf extract.

[0012] Secondly, this application provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, which employs the following technical solution: A method for preparing an antibacterial polyolefin film containing olive leaf extract includes the following steps: Olive leaf extract is dissolved in an ethanol solution to obtain a coating solution. The coating solution is first coated onto a polyolefin film, then dried once. Next, a second coating is applied to the coating layer, followed by a second drying to form an antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract.

[0013] By adopting the above technical solution, olive leaf extract is first dissolved in an ethanol solution to obtain a coating solution. Then, a preliminary coating is applied and dried. Next, a second coating is applied and dried to form a stable antibacterial coating, resulting in an antibacterial polyolefin film containing olive leaf extract.

[0014] In one specific implementation, the thickness of the antibacterial coating is 5-15 μm.

[0015] In one specific implementation, the first drying step is as follows: first drying at 60°C for 40-50 seconds, then drying at 45°C for 2.5-3.5 minutes; the second drying step is as follows: first drying at 60°C for 50-70 seconds, then drying at 45°C for 3.5-4.5 minutes.

[0016] By adopting the above technical solution, each drying is carried out in stages at different temperatures, which not only does not affect the effective components in olive leaf extract, but also dries the solution as quickly as possible.

[0017] Thirdly, the sanitary napkin provided in this application adopts the following technical solution: A sanitary napkin includes a top layer, a core layer, and a bottom layer arranged sequentially. The bottom layer includes an antibacterial polyolefin film containing olive leaf extract, and an antibacterial coating on the antibacterial polyolefin film containing olive leaf extract is adhered to the core layer.

[0018] By adopting the above technical solution, sanitary napkins made from antibacterial polyolefin films containing olive leaf extract not only provide precise antibacterial protection but also reduce the risk of infection, help women pay attention to their health, and control odor.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. In this application, an antibacterial coating containing olive leaf extract is provided on a polyolefin film and applied to sanitary napkins. When the antibacterial coating comes into contact with slightly alkaline menstrual blood, the active ingredients in the olive leaf extract are released and exert an antibacterial effect. In addition, the olive leaf extract has no special effect on the symbiotic bacteria of the skin and has a certain plant-based fragrance that can mask some of the bloody smell. Therefore, it has the effects of antibacterial, odor suppression and maintenance of women's health. 2. The method in this application first dissolves olive leaf extract in an ethanol solution to obtain a coating solution, then performs a preliminary coating and dries it, followed by a second coating and drying to form a stable antibacterial coating, thereby obtaining an antibacterial polyolefin film containing olive leaf extract. 3. The sanitary napkin made from the antibacterial polyolefin film containing olive leaf extract in this application not only plays a precise antibacterial protection role, but also reduces the risk of infection, helps women pay attention to their health, and can also control odor. Detailed Implementation

[0020] The present application will be further described in detail below with reference to the embodiments.

[0021] All raw materials used in the examples were commercially available. Acidic pectinase was provided by Shenzhen Lefu Biotechnology Co., Ltd.; cellulase CAS No.: 9012-54-8; olive leaf extract powder was provided by Shaanxi Wanyuan Biotechnology Co., Ltd.; and olive leaves were provided by Sichuan Tianyuan Olive Oil Co., Ltd.

[0022] Preparation Example 1 Preparation Example 1 provides a method for preparing olive leaf extract, comprising the following steps: Raw material pretreatment: Soak olive leaves in a 0.85% salt solution for 2 hours, then rinse them with clean water and crush them into olive microparticles with a particle size of 1-3 mm. Enzymatic hydrolysis: Water is first added to the olive microparticles, then an enzyme treatment agent is added, and the mixture is enzymatically hydrolyzed at 40°C for 6 hours to obtain the hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is 0.3:100; and the volume ratio of water to the olive microparticles is 3:1. Ultrasonic treatment: The enzymatic hydrolysate was placed in an ultrasonic extractor and ultrasonically treated for 30 minutes at a power of 350W to obtain the treated solution; Filtration: The treatment liquid is filtered using a filter membrane with a pore size of 0.1μm to remove macromolecular impurities and residues, resulting in a crude extract; Refining: Add 0.8 mol / L sulfuric acid solution to the crude extract to adjust the pH to 3, then add 80% ethanol aqueous solution, stir and mix evenly, let stand to separate the layers, and concentrate the organic phase under reduced pressure at 40℃ to one-tenth of the original volume to obtain olive leaf extract; wherein the volume ratio of ethanol aqueous solution to crude extract is 2:1.

[0023] Preparation Example 2 Preparation Example 2 provides a method for preparing olive leaf extract, comprising the following steps: Raw material pretreatment: Soak olive leaves in a 0.87% brine solution for 1.5 hours, then rinse with clean water and crush into olive microparticles with a particle size of 1-3 mm. Enzymatic hydrolysis: Water is first added to the olive microparticles, then an enzyme treatment agent is added, and the mixture is hydrolyzed at 50°C for 4.5 hours to obtain the hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is 0.9:100; and the volume ratio of water to the olive microparticles is 4.5:1. Ultrasonic treatment: The enzymatic hydrolysate was placed in an ultrasonic extractor and ultrasonically treated for 45 minutes at a power of 350W to obtain the treated solution; Filtration: The treatment liquid is filtered using a filter membrane with a pore size of 0.45μm to remove macromolecular impurities and residues, resulting in a crude extract. Refining: Add 0.8 mol / L sulfuric acid solution to the crude extract to adjust the pH to 3, then add 80% ethanol aqueous solution, stir and mix evenly, let stand to separate the layers, and concentrate the organic phase under reduced pressure at 45℃ to one-tenth of the original volume to obtain olive leaf extract; wherein the volume ratio of ethanol aqueous solution to crude extract is 2:1.

[0024] Preparation Example 3 Preparation Example 3 provides a method for preparing olive leaf extract, comprising the following steps: Raw material pretreatment: Soak olive leaves in a 0.89% brine solution for 1 hour, then rinse with clean water and crush into olive microparticles with a particle size of 1-3 mm. Enzymatic hydrolysis: Water is first added to the olive microparticles, then an enzyme treatment agent is added, and the mixture is hydrolyzed at 60°C for 3 hours to obtain an enzymatic hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is 1.5:100; and the volume ratio of water to the olive microparticles is 6:1. Ultrasonic treatment: The enzymatic hydrolysate was placed in an ultrasonic extractor and ultrasonically treated for 60 minutes at a power of 350W to obtain the treated solution; Filtration: The treatment liquid is filtered using a filter membrane with a pore size of 0.45μm to remove macromolecular impurities and residues, resulting in a crude extract. Refining: Add 0.8 mol / L sulfuric acid solution to the crude extract to adjust the pH to 4, then add 80% ethanol aqueous solution, stir and mix evenly, let stand to separate the layers, and concentrate the organic phase under reduced pressure at 50℃ to one-tenth of the original volume to obtain olive leaf extract; wherein the volume ratio of ethanol aqueous solution to crude extract is 2:1.

[0025] Example 1 Example 1 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps: 0.8 kg of olive leaf extract from Preparation Example 1 was dissolved in 8.8 kg of 90% ethanol solution to obtain a coating solution. The coating solution was first coated onto a 20 μm thick polyolefin film, and then dried once. Then, a second coating was applied to the coated layer, and then dried a second time to form a 5 μm thick antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract. The first drying step was: drying at 60°C for 40 s, followed by drying at 45°C for 2.5 min. The second drying step was: drying at 60°C for 50 s, followed by drying at 45°C for 3.5 min.

[0026] Example 2 Example 2 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps: 1 kg of olive leaf extract from Preparation Example 1 was dissolved in 9 kg of 90% ethanol solution to obtain a coating solution. The coating solution was first coated onto a 20 μm thick polyolefin film, and then dried once. Then, a second coating was applied to the coated layer, and then dried a second time to form a 10 μm thick antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract. The first drying step was: drying at 60°C for 45 s, followed by drying at 45°C for 3 min. The second drying step was: drying at 60°C for 60 s, followed by drying at 45°C for 4 min.

[0027] Example 3 Example 3 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps: 1.2 kg of olive leaf extract from Preparation Example 1 was dissolved in 9.2 kg of 90% ethanol solution to obtain a coating solution. The coating solution was first coated onto a 20 μm thick polyolefin film, and then dried once. Then, a second coating was applied to the coated layer, and then dried a second time to form a 15 μm thick antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract. The first drying step was: drying at 60°C for 50 s, followed by drying at 45°C for 3.5 min. The second drying step was: drying at 70°C for 50 s, followed by drying at 45°C for 4.5 min.

[0028] Example 4 Example 4 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps: 1 kg of olive leaf extract from Preparation Example 2 was dissolved in 9 kg of 90% ethanol solution to obtain a coating solution. The coating solution was first coated onto a 20 μm thick polyolefin film, and then dried once. Then, a second coating was applied to the coated layer, and then dried a second time to form a 10 μm thick antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract. The first drying step was: drying at 60°C for 45 s, followed by drying at 45°C for 3 min. The second drying step was: drying at 60°C for 60 s, followed by drying at 45°C for 4 min.

[0029] Example 5 Example 5 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps: 1 kg of olive leaf extract from Preparation Example 3 was dissolved in 9 kg of 90% ethanol solution to obtain a coating solution. The coating solution was first coated onto a 20 μm thick polyolefin film, and then dried once. Then, a second coating was applied to the coated layer, and then dried a second time to form a 10 μm thick antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract. The first drying step was: drying at 60°C for 45 s, followed by drying at 45°C for 3 min. The second drying step was: drying at 60°C for 60 s, followed by drying at 45°C for 4 min.

[0030] Application Example 1 Application Example 1 provides a method for preparing a sanitary napkin, comprising the following steps: The surface layer, core layer, and bottom layer are sequentially laminated to obtain a sanitary napkin; wherein the surface layer is a soft cotton nonwoven fabric; the core layer is an absorbent core; and the bottom layer is the antibacterial polyolefin film of Example 1, and the antibacterial coating on the antibacterial polyolefin film is bonded to the core layer.

[0031] Application Example 2 Application Example 2 provides a method for preparing a sanitary napkin, comprising the following steps: The surface layer, core layer, and bottom layer are sequentially laminated to obtain a sanitary napkin; wherein the surface layer is a soft cotton nonwoven fabric; the core layer is an absorbent core; and the bottom layer is the antibacterial polyolefin film of Example 2, and the antibacterial coating on the antibacterial polyolefin film is bonded to the core layer.

[0032] Application Example 3 Application Example 3 provides a method for preparing a sanitary napkin, comprising the following steps: The surface layer, core layer, and bottom layer are sequentially laminated to obtain a sanitary napkin; wherein the surface layer is a soft nonwoven fabric; the core layer is an absorbent core; and the bottom layer is the antibacterial polyolefin film of Example 3, and the antibacterial coating on the antibacterial polyolefin film is bonded to the core layer.

[0033] Application Example 4 Application Example 4 provides a method for preparing a sanitary napkin, comprising the following steps: The surface layer, core layer, and bottom layer are sequentially laminated to obtain a sanitary napkin; wherein the surface layer is a soft cotton nonwoven fabric; the core layer is an absorbent core; and the bottom layer is the antibacterial polyolefin film of Example 4, and the antibacterial coating on the antibacterial polyolefin film is bonded to the core layer.

[0034] Application Example 5 Application Example 5 provides a method for preparing a sanitary napkin, comprising the following steps: The surface layer, core layer, and bottom layer are sequentially laminated to obtain a sanitary napkin; wherein the surface layer is a soft cotton nonwoven fabric; the core layer is an absorbent core; and the bottom layer is the antibacterial polyolefin film of Example 5, and the antibacterial coating on the antibacterial polyolefin film is bonded to the core layer.

[0035] Comparative Application Example 1 Comparative Application Example 1 provides a method for preparing a sanitary napkin, including the following steps: 0.8 kg of olive leaf extract powder, 0.9 kg of water, and 7.9 kg of propylene glycol were stirred and heated to 45°C. After mixing evenly, an antibacterial solution was obtained. Spunlace nonwoven fabric was soaked in the antibacterial solution at 28°C for 15 minutes and then dried to obtain an antibacterial layer. The surface layer, antibacterial layer, core layer, and bottom layer were sequentially laminated to obtain a sanitary napkin. The surface layer was made of soft cotton nonwoven fabric, the core layer was an absorbent core, and the bottom layer was a 20 μm thick polyolefin film.

[0036] Performance testing Preparation of bacterial suspension: A 24-hour fresh slant culture of the test bacterium *Escherichia coli* was prepared, washed with phosphate buffer, and diluted to approximately 10⁻⁶. 5 ~10 6 CFU / mL; Sample preparation: Cut the sanitary napkin into 20mm×30mm sample pieces with sterile scissors, and then drop 0.1ml of a solution with pH=7.1 onto the surface of the sample piece. The control sample piece needs to be sterilized by pressure steam. The solution is a sodium bicarbonate aqueous solution with pH=9.0, and then carbon dioxide is introduced to adjust the pH to 7.1. Infection and contact: Add 0.1 mL of bacterial suspension to each sample in a sterile Petri dish and place it in a 20°C water bath for 5 minutes to ensure that the bacterial suspension comes into full contact with the sample. Elution and incubation: After contact for the specified time, the sample was placed in a 5.0 mL PBS tube, eluted by shaking, and 1.0 mL of the sample solution was inoculated into a Petri dish and incubated at 36 °C for 48 hours; then the inhibition rate was calculated by colony counting.

[0037] Table 1 Performance test results of sanitary napkins sample Antibacterial rate (%) Application Example 1 71.0 Application Example 2 71.8 Application Example 3 72.0 Application Example 4 73.2 Application Example 5 72.5 Comparative Application Example 1 63.2 Combining Application Example 1 and Comparative Application Example 1, the sanitary napkin in Application Example 1 has a better antibacterial effect. It can be seen that the sanitary napkin made using the antibacterial polyolefin film of this application has better antibacterial properties.

[0038] Based on Application Examples 1-3, it can be seen that when preparing antibacterial polyolefin films, following the raw material ratios and parameters in Examples 1-3 results in antibacterial polyolefin films with better antibacterial properties.

[0039] Combining Application Examples 2, 4, and 5, the sanitary napkin in Application Example 4 showed the best antibacterial effect. This indicates that the preparation conditions in Preparation Example 2 were optimal when preparing olive leaf extract, resulting in the best antibacterial effect of the obtained olive leaf extract.

[0040] The sanitary napkins from Application Example 4 were cut into 20mm × 30mm samples using sterile scissors. Then, 0.1ml of the solution was dropped onto the surface of each sample, with the pH values ​​of the solutions being 4.3, 6.8, 7.4, and 8.5, respectively. The pH of the solution was adjusted by changing the amount of carbon dioxide passed into a sodium bicarbonate aqueous solution with a pH of 9.0. The antibacterial performance was then tested again, and the antibacterial rate was calculated.

[0041] Table 2. Results of antibacterial performance at different pH levels sample Antibacterial rate (%) pH=4.3 55.2 pH=6.8 72.8 pH=7.1 73.2 pH=7.4 73.1 pH=8.5 63.7 As shown in Table 2, the sanitary napkins of this application release the active ingredients in the olive leaf extract under pH conditions of 6.8-7.4, thus resulting in a better antibacterial effect.

[0042] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An antibacterial polyolefin film containing olive leaf extract, characterized in that: The invention includes a polyolefin film and an antibacterial coating disposed on the polyolefin film; the raw materials of the antibacterial coating include 8-12 parts by weight of olive leaf extract and 88-92 parts by weight of ethanol solution; the preparation method of the olive leaf extract includes the following steps: raw material pretreatment: soaking olive leaves in a salt water solution with a mass concentration of 0.85%-0.9% for 1-2 hours, then rinsing them with clean water, and then crushing them into olive microparticles with a particle size of 1-3 mm; Enzymatic hydrolysis: Water is first added to olive microparticles, then an enzyme treatment agent is added, and the mixture is kept at 40-60℃ for 3-6 hours to obtain an enzymatic hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acid pectinase; Ultrasonic treatment: The enzymatic hydrolysate is placed in an ultrasonic extractor and ultrasonically treated to obtain the treated solution; Filtration: The liquid is filtered using a filter membrane with a pore size of 0.1-0.45μm to remove macromolecular impurities and residues, resulting in a crude extract. Refining: Add 0.8 mol / L sulfuric acid solution to the crude extract to adjust the pH to 3-4, then add ethanol aqueous solution, stir and mix evenly, let stand to separate the layers, and concentrate the organic phase under reduced pressure to obtain olive leaf extract.

2. The antibacterial polyolefin film containing olive leaf extract according to claim 1, characterized in that: In the enzymatic hydrolysis step, the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is (0.3-1.5):

100.

3. The antibacterial polyolefin film containing olive leaf extract according to claim 2, characterized in that: In the extraction step, the temperature for vacuum concentration is 40-50℃, and the concentration is reduced to one-tenth of the original volume to obtain olive leaf extract.

4. A method for preparing an antibacterial polyolefin film containing olive leaf extract as described in any one of claims 1-3, characterized in that: Includes the following steps: Olive leaf extract is dissolved in an ethanol solution to obtain a coating solution. The coating solution is first coated onto a polyolefin film, then dried once. Next, a second coating is applied to the coating layer, followed by a second drying to form an antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract.

5. The method for preparing an antibacterial polyolefin film containing olive leaf extract according to claim 4, characterized in that: The thickness of the antibacterial coating is 5-15 μm.

6. The method for preparing an antibacterial polyolefin film containing olive leaf extract according to claim 5, characterized in that: The first drying step is as follows: first dry at 60℃ for 40-50 seconds, then dry at 45℃ for 2.5-3.5 minutes; the second drying step is as follows: first dry at 60℃ for 50-70 seconds, then dry at 45℃ for 3.5-4.5 minutes.

7. A sanitary napkin, characterized in that: It includes a top layer, a core layer and a bottom layer arranged sequentially, wherein the bottom layer includes an antibacterial polyolefin film containing olive leaf extract as described in any one of claims 1-3, and the antibacterial coating on the antibacterial polyolefin film containing olive leaf extract is bonded to the core layer.